Atlantic Technological University is a technological university in the west and north-west of Ireland. It was formally established on 1 April 2022 as a merger of three existing institutes of technology (ITs) – Galway-Mayo IT, IT Sligo, and Letterkenny IT – into a single university, the fourth such TU in Ireland.

The Galway-Mayo Institute of Technology was an institute of technology, located in Galway, Ireland. In April 2022, it was formally dissolved, and its functions were transferred to Atlantic Technological University (ATU). Now a constituent institute of ATU, it has facilities in the west of Ireland. GMIT's campuses are located in Galway City, Castlebar, Letterfrack and Mountbellew. GMIT won The Sunday Times Institute of Technology of the Year award in 2004, 2007, 2015 and 2022. GMIT also has a number of specialist research centres and two Innovation Hubs.